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Recent content by chiph

  1. chiph

    Internal threading problems

    It's being done on a manual[engine] lathe. I believe it can be successfully done by turning the headstock in reverse with the toolbit face-up on the far[away] side of the headstock spindle and feeding out from the bottom of the hole. The reason for doing this is as follows; 1.I won't be working...
  2. chiph

    Internal threading problems

    thanks guys but, as far as i know, unless the lathe has a metric pitch leadscrew the half-nut lever cannot be disengaged once the metric thread has been started. even with a thread dial indicator. i've looked at valenite and carmex threading inserts and holders and it appears as though the...
  3. chiph

    Internal threading problems

    thanks for the thought but, it's a metric pitch thread so i can't disengage the half-nut lever[i think].
  4. chiph

    Internal threading problems

    Hello, I have a problem where I have to cut a 48mm internal R.H. thread into a blind hole @ 3 inches deep. I propose to cut the thread in reverse with a left hand boring bar and feed out of the hole. I have enough room to relieve the bore at the bottom of the hole and I think it will be easier...
  5. chiph

    Machining effects on Y and T of 1144

    How will the yield and tensile strength of a 3" round bar of "Stressproof" 1144 [ASTM A311 CL B] be compromised by turning the O.D. to 2"? Thanks in advance. chip
  6. chiph

    looking for equivalent to Rycut 40AX

    thanks for both replies. chemistry is not a real issue in this instance. i've been using 3" 4340 bars. i'm just trying to get similar strength but, increase machinabilty.
  7. chiph

    looking for equivalent to Rycut 40AX

    anyone have a supplier for chromoly steel bar which is similar to rycut40ax? T @ 103ksi, Y @93, E @ 19%, machinability @ 100. thanks, chip
  8. chiph

    certification requirements for D17.1 or 1595 ?

    CWIC, thanks for your input [and patience]. regards, chip
  9. chiph

    certification requirements for D17.1 or 1595 ?

    CWIC, would the engineering authority be considered the aircraft manufacturer and/or their engineering dept? also, if a fillet weld test is required is it something in the order of a tube to plate connection in the 5F position, such as in D1.1? thanks, chip
  10. chiph

    certification requirements for D17.1 or 1595 ?

    1. flight hardware [elevator[?] bellcrank] 2.not sure what A, B, C, is. if it's process, it's gtaw 3. tube to plate 4. probably fillet, but not sure yet. haven't seen repair procedure or, A/D. i've just been approached regarding this issue. no paperwork yet. 5. gtaw[guess that's not A, B, C]...
  11. chiph

    certification requirements for D17.1 or 1595 ?

    i'm just looking for some general procedural information on MIL-STD-1595 [AMS-STD-1595] or, even AWS D17.1 for 4130. such as diameter and wall thickness limitations and other requirements. thanks, chip
  12. chiph

    brass brazing

    Harris just marketed a product they are calling BLOCKADE. It might be what you are looking for or, you can check their website for additional info.
  13. chiph

    Welding 304L PLate to A500B Tube

    evelrod, ever had outgassing and porosity problems when o.f. or gta welding unknown steels? try some 347. the niobium is a great scavenger and prevents carbides from forming. works better than alka-seltzer[haha].
  14. chiph

    4130 welding, need advice

    400fnSport is probably getting more input on this question than he really wanted but, this has developed into a discussion/debate that i have been involved with for almost 20 years. My "current opinion" is that if ductility of the weld is important then it is ok to undermatch the...
  15. chiph

    Welding 304L PLate to A500B Tube

    i agree with welding1, that 309 is the filler of choice for most "stainless" to carbon steel welds. he also mentions that dilution can cause a problem. my experience has been that if i am to machine this connection after welding, i will use er347. i am not a metallurgist, but i...
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